In 1970, a sixty-five-year-old Philadelphian named Maggie Kuhn began vocally opposing the notion of mandatory retirement. Taking inspiration from the civil rights and anti-Vietnam War movements, Kuhn and her cohorts created an activist organization that quickly gained momentum as the Gray Panthers. After receiving national publicity for her efforts—she even appeared on the Tonight Show with Johnny Carson —she gained thousands of supporters, young and old. Their cause...